Denial of the Holocaust is an antisemitic conspiracy theory that asserts that the genocide of Jews by the Nazis is a fabrication or exaggeration. It includes making one or more of the following false claims:
The methodologies of Holocaust deniers are based on a predetermined conclusion that ignores overwhelming historical evidence to the contrary. Scholars use the term denial to describe the views and methodology of Holocaust deniers in order to distinguish them from legitimate historical revisionists, who challenge orthodox interpretations of history using established historical methodologies. Holocaust deniers generally do not accept denial as an appropriate description of their activities and use the euphemism revisionism instead. In some former Eastern Bloc countries, Holocaust deniers do not deny the mass murder of Jews but deny the participation of their own nationals in the Holocaust.
Holocaust denial has roots in postwar Europe, beginning with writers like Maurice Bardèche and Paul Rassinier. In the U.S., the Institute for Historical Review (IHR) gave the movement a pseudo-scholarly platform and helped spread it globally. In the Islamic world, it has been long used to delegitimize Israel by framing the Holocaust as a fabricated justification for the creation of the Jewish state. The Islamic Republic of Iran is the leading state sponsor, embedding denial into its ideological and foreign policy agenda through state-backed conferences and cartoon contests. Holocaust denial is considered a serious societal problem in many places where it occurs, and it is illegal in Canada, Israel, and many European countries, including Germany itself.